What is Dental Dam?
Dental Dam: A dental dam is a thin sheet of latex or polyurethane you place over the vulva or anus during oral sex to lower the chance of passing STIs between partners.
Also known as: oral dam, safer sex square.
A dental dam is a thin, flexible sheet, usually latex or a latex free material like polyurethane, that acts as a barrier during oral sex. You lay it over the vulva or anus before your mouth makes contact, and it blocks direct skin contact and the exchange of fluids. The name sounds like it belongs in a dentist's office, and it does have roots there. Dentists originally used small latex sheets to isolate a tooth during work. Safer sex educators borrowed the idea because it does the same basic job, creating a barrier that still lets sensation through.
If the whole idea is new to you, that is completely normal. A lot of people know about condoms for penetrative sex but have never heard anyone explain how a barrier works for oral sex. Once you have used one a couple of times, it becomes a simple, low effort part of getting intimate, no different than reaching for lube or a condom. Go at your own pace, ask questions, and treat it as one more way you and a partner look after each other.
What Is a Dental Dam and How Does It Work
A dental dam works as a physical barrier. When you place it over the vulva or anus, it stops direct mouth to skin contact and stops fluids from passing between partners during oral sex. STIs like herpes, HPV, gonorrhea, and chlamydia can spread through oral contact even when there is no penetration involved, so a barrier method matters for oral sex just as it does for intercourse.
The sheet is thin enough that warmth and pressure still come through, so it does not have to feel like a wall between you and a partner. Most dams are square or rectangular, usually a few inches across, big enough to cover the area with room to hold onto the edges. Some are pre made products sold specifically as dams, others are homemade from a condom or a glove, which we will cover below.
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How to Use a Dental Dam During Oral Sex
Check the package before you start. Look at the expiration date and make sure the wrapper is not damaged, torn, or sun faded, since heat and light break latex down over time. Unfold the dam fully and hold it flat against the vulva or anus, covering the whole area you will have mouth contact with.
A dab of water based or silicone based lube on the body side of the dam before you place it can make sensation more noticeable and help it stay put. Water based and silicone based lubes are both safe with latex, since oil based lubricants can weaken and break down latex over time. Some people hold the dam in place with their own hands, others tuck the edges under close fitting underwear for a hands free option.
Use one side of the dam only for the entire session, and do not flip it over partway through, since that can move fluid from one surface to the other. If you are switching between partners, switching acts, or moving from anal to vaginal contact, use a fresh dam each time. Throw it away after use, a dental dam is a single use item just like a condom.
How to Make a Dental Dam From a Condom or Glove
If you do not have a manufactured dam on hand, you can make one from an unlubricated or flavored condom. Unroll the condom fully, then cut off the closed tip and the ring at the open end with scissors, so you are left with a tube. Cut lengthwise down the tube in one straight line and unfold it flat, and you now have a makeshift barrier sheet.
A latex glove works in a similar way, though it covers a smaller area since it is shaped for fingers. Cut off all the fingers, then cut up one side of the glove and unfold it into a flat sheet. This method leaves more seams and thinner spots than a purpose built dam, so it is a backup option rather than a first choice.
Avoid spermicidal condoms for this purpose, since spermicide is not meant for oral contact and can taste unpleasant or irritate the mouth. A flavored condom cut open this way can actually make the experience nicer for both of you. When you have the option, a dam made specifically for this purpose is the most reliable choice, since it is designed as one solid sheet with no seams to worry about.
Is a Dental Dam Safe to Use
Most dams are made from latex, which works well for most people but is not an option if you or a partner have a latex allergy. Polyurethane and nitrile dams exist for people who need a latex free option, and they still block fluid transfer effectively. If anyone in the encounter has had a reaction to latex before, such as itching, hives, or swelling, switch to a non latex material and mention it to a doctor if the reaction was ever severe.
Store dams somewhere cool and dry, away from direct sunlight and away from a wallet or glove box where heat can degrade the material. Always check for tears, thin spots, or a faded wrapper before use, and never reuse a dam even if it looks fine, since it may have microscopic damage you cannot see.
A dental dam greatly reduces the risk of passing STIs during oral sex, but it does not remove the risk completely. Skin around the edges of the dam is still exposed, and some infections like herpes and HPV can spread through skin contact in areas the dam does not cover. Regular STI testing for you and any partners, alongside barrier use, gives you a clearer picture of your sexual health than a barrier alone. If you have specific concerns about a symptom or an exposure, a doctor or sexual health clinic is the right place to ask, not a general article like this one.
Talking to Your Partner About Using a Dental Dam
Bringing up a dental dam is easiest before you are already in bed together. A quick, relaxed comment works better than a serious speech, something like mentioning that you like using a barrier for oral sex and asking if they are comfortable with that too. Framing it as something you do for both of you, rather than a comment on their sexual history, keeps the conversation from feeling accusatory.
If a partner has never used one, they may have questions about how it feels or how to use it, and that is a good sign they are taking it seriously. Flavored dams can make the conversation lighter and the experience more enjoyable, so it does not have to feel purely clinical. Keeping a few dams and a bottle of water based lube in the same place as your other safer sex supplies makes it easy to reach for them without breaking the mood.
Where to Buy Dental Dams and What to Look For
Dental dams are usually sold alongside condoms in the safer sex section of a store, since they serve the same basic purpose of reducing STI transmission. Look for the material listed on the box, latex or a latex free option like polyurethane, and check whether it is flavored or unflavored depending on your preference. Some brands sell dams in multi packs, which is useful if you expect to use them regularly.
If you cannot find a dedicated dam locally, unlubricated condoms are widely available and work well as a DIY substitute using the method described above. Whatever you choose, keep a few water based lube sachets nearby, since a dry dam feels less pleasant and slips around more easily than one used with a little lubrication.
Dental Dam vs Condom: Quick Comparison
| Dental Dam | Condom | |
|---|---|---|
| Used for | Oral sex on the vulva or anus | Penetrative sex, oral sex on a penis |
| How it works | Flat sheet held over the area | Rolled sheath worn over the penis or a toy |
| Materials | Latex, polyurethane, nitrile | Latex, polyisoprene, polyurethane, lambskin (no STI protection) |
| Lube pairing | Water based or silicone based lube with latex versions, avoid oil based | Water based or silicone lube with latex, check compatibility with other materials |
| Reusable | No, single use only | No, single use only |
Types of Dental Dam
Dental dams come in a few common forms, and knowing the differences helps you pick what fits your needs.
- Latex dam: The most common and widely available type, effective as a barrier but not suitable if you have a latex allergy.
- Polyurethane dam: A latex free option, thinner in feel, good for people with latex sensitivities.
- Nitrile dam: Another latex free material, often used in gloves as well, chosen by people avoiding latex.
- Flavored dam: Coated with a flavor to make oral contact more pleasant, popular for reducing the clinical feel of barrier use.
- DIY dam from a condom: A cut open condom unfolded into a flat sheet, a useful backup when a manufactured dam is not on hand.
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Key Things to Know
- A dental dam blocks direct mouth to skin contact during oral sex, which lowers the chance of passing STIs between partners.
- Water based or silicone based lube is safe with latex dams, since oil based lubricants can break down latex and weaken the barrier.
- A dam is single use only, using one side once and throwing it away afterward keeps the barrier reliable.
- Latex allergy sufferers should choose a polyurethane or nitrile dam instead, since a reaction can range from mild itching to a more serious response.
- No barrier method removes all STI risk, so pairing dam use with regular testing gives you a clearer picture of your sexual health.
FAQ
What is a dental dam actually used for?
A dental dam is used as a barrier during oral sex on the vulva or anus, placed over the area before mouth contact begins. It blocks direct skin contact and stops fluids from passing between partners, which lowers the chance of spreading STIs through oral sex. It is the oral sex equivalent of a condom, covering an area a condom is not shaped for.
Can I use plastic wrap as a dental dam?
Kitchen plastic wrap is not designed or tested as a barrier for sexual health use, so it is not something we recommend relying on. It was never made to specifications for this purpose, and its thickness and material can vary between brands in ways that are not tested for safety here. A manufactured latex or polyurethane dam, or a condom cut open into a flat sheet, is a far more reliable choice.
Do dental dams remove all risk of getting an STI?
No barrier method removes all risk, and a dental dam is no exception. It greatly reduces the chance of transmission for infections spread through fluids and direct oral contact, but skin around the edges of the dam is still exposed. Combining barrier use with regular STI testing gives you and a partner a much clearer picture of your sexual health over time.
Are dental dams reusable?
No, a dental dam is a single use product, just like a condom. Flip it, reuse it, or share it between acts and you risk moving fluid or bacteria from one surface to another. Use one side once, then throw it away and grab a fresh one if you continue.
Do dental dams come in flavors?
Yes, many dams and the condoms used to make DIY versions come in flavored options. Flavors can make the experience more enjoyable and take some of the clinical feel out of using a barrier. Unflavored versions are also widely available if you or a partner prefer a plain barrier.
Can I use lube with a dental dam?
Yes, a small amount of water based or silicone based lube on the body side of the dam can make sensation come through more clearly and help the dam stay in place. Stick with water based or silicone based lube if you are using a latex dam, since oil based products can weaken latex over time. Check the manufacturer's guidance if you are using a polyurethane or nitrile dam, since compatibility can differ by material.
Related Terms
Sources
- CDC: “DO use water-based or silicone-based lubricant to prevent breakage.”
- Cleveland Clinic: “A dental dam is a thin, flexible piece of latex or polyurethane you can use to reduce your risk of spreading sexually transmitted infections during oral sex.”
- Planned Parenthood: “A dental dam is a thin, flexible, square made of latex, polyurethane, nitrile, or neoprene that helps prevent the spread of STDs during oral sex.”
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